PURPOSE: To make the width of a watch case narrower against the plate thickness without producing any cracks, by blanking a blanked and punched blank with cutting dies which simultaneously perform punching and blanking.

CONSTITUTION: The figure shows the case where a blank 5 is shaving-worked by a top die set 1, bottom die set 10, and die parts fitted to a die post 11. The inner shape of the blank 5 is formed by a top punch 3 and bottom punch 7. The outer shape is formed by a top die 4 and the bottom punch 7. At the time of blanking operations, the blank 5 is guided by a guide plate 8 and discharged after working by means of an upper stopper 2. A cushion 9 is used for pushing up the guide plate 7 after working. Blanked dust 6 is removed after working. The working timing of this cutting dies is set in such a way that after the top punch 3 is lowered and starts punching against the blank 5 and before completing the punching work, the top die 4 is lowered and contacted with the outer shape part of the blank 5.